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alk in freezer moisture refreeze on ceiling

Working on a small walkin freezer that is about 1 1/2 yrs old. It has had the issue of moisture refreezing on the ceiling. Did have a backed up drain. That has been fixed. Otherwise freezer working ok. The defrost cycle does terminate aprox. 20 min. Looking for ideas to look at.

Clearing the drain will help rid excess moisture. Other things to look for are if the fans are not staying off after defrost until the coil refreezes. Also if you defrost too often, the water drops will vaporize instead of forming a drop and running down the coil and drain.

Typically a defrost termination issue, not terminating on temp and fans coming on while coil still warm. Force it into defrost with no ice on coil, should terminate pretty quick and fans should not start for a few minuts.

What I came up with is the defrost term. Switch is working. I have 208v between 3 and X back at the clock. Still will not term defrost. Must have a bad defrost term relay in the time clock. Is this a common thing?

What I came up with is the defrost term. Switch is working. I have 208v between 3 and X back at the clock. Still will not term defrost. Must have a bad defrost term relay in the time clock. Is this a common thing?

The failure I have found is the plastic yoke breaks in the back of the clock. It's toast.

Make sure you configure the jumper strips on the new clock to be identical to the old, since not all designs use the clock terminals in an identical manner.